S12700 Series Agile Switches Hardware Description

This document describes hardware components of the S12700, including the cabinet, chassis, power supply facilities, fan modules, cards, cables, and pluggable modules for interfaces. You can find useful information about S12700 hardware components from this document.

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Power Supply Slot Configuration

NOTE:

If a switch is running a version prior
to V200R010C00, it does not allow combining the use of AC and DC power
modules or power modules of different wattages. If the switch is running
V200R010C00 or a later version, it allows combining the use of 2200
W AC and DC power modules. If the switch is running V200R012C00 or
a later version, it allows combining the use of 2200 W AC, 2200 W
DC, and 3000 W AC power modules.

The S12712
series switches support three redundancy modes of power modules: N+N,
N+1, and N+0. The value of N depends on the maximum power actually
required by the system. Ensure that the total maximum output power
of N power modules (N x maximum output power of each power module)
is larger than the maximum power actually required by the system.
For example, the maximum power required by the system is 4000 W. If
two 2200 W power modules are installed in the chassis, they work in
2+0 mode. If three 2200 W power modules are installed, they work in
2+1 redundancy mode. If four 2200 W power modules are installed, they
work in 2+2 redundancy mode. The system can identify the power redundancy
mode, and you do not need to manually configure the power redundancy
mode. Table 4-25 describes the three
power redundancy modes and the specific redundancy modes supported
by the S12712 series switches.

Table 4-25 Description of power redundancy modes

Redundancy Mode

Description

Product Support

N+N

System power supply is not affected if no more than N power modules
are removed or fail.

The maximum output power of the system is the total maximum output
power of N power modules.

The first N represents mandatory power modules, and the second
N represents optional power modules.

NOTE:

The N+N redundancy mode is
often used when two power supply systems are available. In this case,
the first N represents mandatory power modules for the first power
supply system, and the second N represents mandatory power modules
for the second power supply system. The use of double power supply
systems provides redundancy for both power modules and power supply
systems.

1+1, 2+2, and 3+3 redundancy

N+1

System power supply is not affected if one power module is removed
or fails.

The maximum output power of the system is the total maximum output
power of N power modules.

N power modules are mandatory, and one power module is optional.

1+1, 2+1, 3+1 and 4+1 redundancy

NOTE:

The S12712 series switches support 5+1 redundancy of power modules
when using 110 V single-live-wire AC power input.

N+0 (no redundancy)

System power supply is affected once any power module is removed
or fails.

The maximum output power of the system is the total maximum output
power of N power modules.

N power modules are mandatory, and there are no optional power
modules.

1+0, 2+0, 3+0, and 4+0

NOTE:

The S12712
series switches support 5+0 and 6+0 modes of power modules when using
110 V single-live-wire AC power input.

NOTE:

When using the N+N redundancy mode, equally divide the power
modules into two groups and connect the two groups of power modules
to two independent power supply systems. This configuration provides
redundancy of power supply systems to enhance system reliability.

If the system power consumption exceeds 50% of a single power
module's power, all power modules equally share the power consumption.
This reduces the load of a single power module and improves the system
reliability.

The following describes the power module configuration
for an S12712 switch with different power supplies:

If DC power input is provided, configure power modules according
to DC power input.

A maximum of 4 (4+0) 2200 W DC power modules
can be configured, providing a maximum output power of 8800 W.

AC power input (220 V single-phase
or 110 V dual-live-wire input)

NOTE:

If the input voltage is 110 V, the dual-live-wire input
mode is recommended. In this case, the maximum output power of a 2200
W AC power module is 2200 W, the maximum output power of a 3000 W
AC power module is 3000 W, the maximum output power of an 800 W AC
power module is 800 W.

Table 4-27 describes
the power module configuration for the S12712 series switches when
220 V single-phase or 110 V dual-live-wire AC power input is provided.

A maximum of 3 (3+0) 3000 W AC power modules can be configured,
providing a maximum output power of 8800 W.

AC power input (110 V single-live-wire
input)

NOTE:

When
110 V single-live-wire AC power input is provided, the maximum output
power of a 2200 W AC power module is 1100 W, the maximum output power
of a 3000 W AC power module is 1500 W, the maximum output power of
an 800 W AC power module is 400 W. In this case, it is recommended
that you use the N+1 or N+0 redundancy mode to increase the maximum
output power of the system.

Table 4-28 describes the power module configuration
for the S12712 series switches when 110 V single-live-wire AC power
input is provided.

A maximum of 6 (6+0) 3000 W AC power modules can be configured,
providing a maximum output power of 8800 W.

Heat Dissipation

NOTE:

It is recommended
that you replace the air filter of a device every six months.

The cooling system of an S12712 chassis consists of fan modules behind
the air exhaust vent (rear of the chassis) and air filters at the
air intake vent (left side of the chassis).

The S12712 has five fan modules respectively,
located at the rear of the chassis. The fan modules absorb airflow
to exhaust the heat generated by cards and other modules out of the
chassis, ensuring that the chassis works in a normal temperature range.
For the performance and attributes of fan modules, see Fan Module.

Air filters on a chassis prevent dust from entering the chassis
with the airflow.

The S12712 uses a multi-zone cooling
system design. If there are empty slots in a zone, the fans in this
zone run at a low speed to reduce power consumption and noises.

As shown in Figure 4-37, the S12712 has five fan zones, with a fan module in
each zone. Slots 04, 07, 10, and 15 each belong to two fan zones and
are cooled by two fan modules.

Figure 4-37 Fan zones in the S12712 chassis

Airflow

NOTE:

The S12704, S12708, and S12712
have the same airflow for heat dissipation. The S12708 is used as
an example to describe the airflow.

The S12712 chassis uses a left-to-back airflow design. Air is absorbed
into the chassis from the left side and exhausted out of the chassis
from the rear. Figure 4-38 shows the
airflow.

Figure 4-38 Airflow in the chassis

Air Filter

NOTE:

The switches may use honeycomb air filters or non-honeycomb air filters.
The switches with honeycomb air filters installed in all air filter
slots comply with Federal Communications Commission (FCC) standards.